ZRL_DESTROYED
ASSERT3S((int32_t)n, >, ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
ASSERT3S(zrl->zr_refcount, >, ZRL_DESTROYED);
zrl->zr_refcount = ZRL_DESTROYED;